Async Expert is a 86-lesson 33 hours 11 minutes self-paced course by Konrad Kokosa, Szymon Kulec, Łukasz Pyrzyk. Master asynchronous programming in .
Master asynchronous programming in .NET with the Async Expert course. You will experience a deep dive from the basics to advanced techniques, such as async-await, working with concurrent collections, and managing parallelism.
The course includes homework assignments to consolidate knowledge as well as exclusive materials from recognized experts: Marc Gravell, Daniel Marbach, and Stephen Cleary.
Update: It was decided to also add the course C# 9.0 Professional to the collection.
Konrad Kokosa is a Polish .NET specialist and the author of Pro .NET Memory Management (Apress) — the canonical reference work on the CLR memory model and garbage collector. He runs Dotnetos, a .NET training company focused entirely on the deep performance side of the platform.
His CourseFlix listing carries two Konrad Kokosa courses: .NET Memory Expert and Async Expert. Material is paid and aimed at senior .NET engineers working on performance-critical applications who need to understand the CLR at the level the framework hides from most developers.
Szymon Kulec is a Polish .NET engineer (Microsoft MVP) and one of the contributors to the Async Expert course on advanced .NET asynchronous programming, alongside Konrad Kokosa and Łukasz Pyrzyk on the Dotnetos training platform.
His CourseFlix listing carries Async Expert — a deep dive into the async/await model in .NET, covering the synchronisation context, ConfigureAwait, the thread-pool interactions, and the production-debugging patterns for async-heavy code.
Material is paid and aimed at senior .NET developers working on performance-critical applications where the async model needs to be understood at the level of the runtime rather than the language surface.
Łukasz Pyrzyk is a Polish .NET engineer and one of the contributors to the Async Expert course on advanced .NET asynchronous programming. He works alongside Konrad Kokosa and Szymon Kulec on the Dotnetos training platform, focused entirely on the deep performance side of .NET.
His CourseFlix listing carries Async Expert — a deep dive into the async/await model in .NET, covering the synchronisation context, ConfigureAwait, the thread-pool interactions, and the production-debugging patterns for async-heavy code.
Material is paid and aimed at senior .NET developers working on performance-critical applications. For broader content, see CourseFlix's C# category page.
| # | Lesson Title | Duration | Access |
|---|---|---|---|
| 1 | Course overview Demo | 05:38 | |
| 2 | BenchmarkDotNet basics | 22:33 | |
| 3 | Demo: sharplab.io | 10:07 | |
| 4 | Demo: ConcurrencyVisualizer | 09:45 | |
| 5 | Demo: Parallel Stacks/Tasks | 08:10 | |
| 6 | Homework | 01:23 | |
| 7 | Threads | 01:42:37 | |
| 8 | ThreadPool | 01:37:50 | |
| 9 | Demo: ThreadPool use with different API | 20:27 | |
| 10 | Demo: ThreadPool.BindHandle usage | 19:36 | |
| 11 | Homework | 01:30 | |
| 12 | Task API | 01:16:11 | |
| 13 | Async-await foundations | 01:55:31 | |
| 14 | Async eliding | 19:59 | |
| 15 | ValueTask | 23:46 | |
| 16 | Task API and async | 27:37 | |
| 17 | Homework | 01:06 | |
| 18 | Execution, contexts, scheduler | 01:30:08 | |
| 19 | Sync vs async | 43:53 | |
| 20 | Fire and forget | 17:56 | |
| 21 | TaskCompletionSource | 24:45 | |
| 22 | Awaitables | 25:36 | |
| 23 | Locals | 37:31 | |
| 24 | Homework | 01:22 | |
| 25 | Tasks aggregations | 45:33 | |
| 26 | IAsyncDiposable | 17:39 | |
| 27 | IAsyncEnumerable | 15:01 | |
| 28 | Demo: gRPC with IAsyncEnumerable | 07:05 | |
| 29 | Demo: New SQL client | 03:34 | |
| 30 | Demo: Timeout with WhenAny and WhenAll | 05:34 | |
| 31 | Homework | 00:46 | |
| 32 | Hardware | 40:02 | |
| 33 | volatile | 15:41 | |
| 34 | Demo: Epoch programming in ConcurrentQueue | 15:09 | |
| 35 | Interlocked | 19:39 | |
| 36 | Demo: simple pool with Interlocked.Exchange | 03:54 | |
| 37 | Barriers and alignment | 09:36 | |
| 38 | Demo: range reservation with Aeron.NET and Interlocked.CompareExchange | 10:48 | |
| 39 | Homework | 01:08 | |
| 40 | Exclusive locking - part 1 | 24:13 | |
| 41 | Demo: decompiling lock | 06:17 | |
| 42 | Exclusive locking - part 2 | 09:57 | |
| 43 | Demo: non-blocking usage of Monitor.TryEnter | 07:35 | |
| 44 | Exclusive locking - part 03 | 08:21 | |
| 45 | Non-exclusive locking - part 1 | 11:07 | |
| 46 | Demo: task throttling with Task and SemaphoreSlim | 08:03 | |
| 47 | Non-exclusive locking - part 2 | 07:38 | |
| 48 | Demo: Building custom string pool with ReaderWriterLock | 12:10 | |
| 49 | Non-exclusive locking - part 3 | 06:09 | |
| 50 | Signalling | 13:20 | |
| 51 | Asynchronous primitives - part 1 | 05:51 | |
| 52 | Demo: AsyncLock implementation | 21:33 | |
| 53 | Asynchronous primitives - part 2 | 15:58 | |
| 54 | Homework | 01:10 | |
| 55 | Foundations | 20:52 | |
| 56 | BlockingCollection | 11:56 | |
| 57 | ConcurrentStack | 16:43 | |
| 58 | Demo: object cache with ConcurrentStack | 04:11 | |
| 59 | ConcurrentQueue | 22:24 | |
| 60 | Demo: memory pool in Kestrel ASP.NET with ConcurrentQueue | 07:39 | |
| 61 | ConcurrentDictionary | 17:08 | |
| 62 | Demo: efficient caching with ConcurrentDictionary.GetOrAdd | 04:01 | |
| 63 | ConcurrentBag | 06:18 | |
| 64 | Homework | 00:47 | |
| 65 | Introduction | 16:29 | |
| 66 | Pipelines | 26:22 | |
| 67 | Demo: TcpEcho | 18:29 | |
| 68 | Channels | 19:56 | |
| 69 | Demo: Usage of the Channel<T> in ASP.NET Core | 07:21 | |
| 70 | Homework | 01:03 | |
| 71 | IValueTaskSource with Interlocked.CompareExchange | 19:13 | |
| 72 | IValueTaskSource based on an array with token discriminator | 11:01 | |
| 73 | ValueTask and pooling in .NET 5 | 11:26 | |
| 74 | ManualResetValueTaskSourceCore | 11:33 | |
| 75 | False Sharing | 09:56 | |
| 76 | Demo: Hosted services with IHostBuilder, IHostedService and ConcurrentQueue | 13:19 | |
| 77 | F# async vs C# async | 29:14 | |
| 78 | What's new in CancellationTokens for .NET 5 and beyond | 13:11 | |
| 79 | Summary of the course | 14:03 | |
| 80 | Marc Gravell, webinar nr 1 | 01:25:05 | |
| 81 | Daniel Marbach, webinar nr 2 | 01:01:11 | |
| 82 | Steve Cleary, webinar nr 3 | 01:05:19 | |
| 83 | Daniel Marbach, webinar nr 4 | 01:08:21 | |
| 84 | Marc Gravell, webinar nr 5 | 01:05:40 | |
| 85 | Steve Cleary, webinar nr 6 | 01:20:20 | |
| 86 | Daniel Marbach, webinar nr 7 | 55:41 |
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